Bottom bracket with square pin for 68 mm bike bottom. Quick and easy installation without adjustment. The built-in system can protect the frame, higher power, it is better than the normal bottom bracket of the structure. Fine workmanship, small dimensional error, 2-bearing precision wire design, which allows it to better connect to the bike arm SEALED BEARING: Sealed cartridge bearing assembly - maintenance-free sealed cartridge protects against dirt, mud and water. 【Good Service】If you have any problems with this product, you can contact us at any time
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